use better examples - user id 404 might be mistaken for an http status code, and 'song:played' is a more realistic action (to most people).
Also fix formatting (this file is using restructured text, not markdown).
there are a number of issues with the container configuration:
* the rezzza.bitter.class parameter was not defined
* there was a typo in either the config.yml or the first parameter to the rezzza.bitter service